Well that's one way to cause a headache! Flatworm mates with its own head!

What are flatworms?
Platyhelminthes or flatworms are unsegmented, bilaterial (have front/back and upside/downside), soft bodied invertebrates (lack a vertebral (spinal) column). They have no body cavity and are referred to as acoelomates, they have a flattened body shape due to lacking specialized circulatory and respiratory organs i.e blood/lungs, the flattened shape allows oxygen to diffuse (a process in which a substance moves from a area of high amount to one which is lower) into their bodies easily.
Free living flatworms are either found in water or humid areas such as leaf litter on land tapeworms (Cestodes) and flukes (Trematodes) have parasitic lifestyles which are often complex and involve multiple hosts in fact, the second most deadly human disease is called by the pork tapeworm (Taenia solium) which is the main cause of epilepsy worldwide when their larvae infect the human nervous system.

Procotyla fluviatilis

What they discovered
Scientists from the University of Basel based in Switzerland and Bielefield University based in Germany, discovered that the flatworm Macrostomum hystrix, an hermaphrodite possessing both male and female reproductive organs, uses self insemination when it is unable to locate a mate. Normally reproduction occurs with these flatworms by exchanging of sperm between two individuals via a stylet (a needle like protrusion) and is described as 'traumatic insemination'. 
The study divided flatworms into two groups one which was isolated and the other which consisted of small groupings of individuals. The amount of sperm possessed by each flatworm was measured and it was found that isolated individuals contained more in their head. Self insemination was never witnessed but the placement suggests a interesting insemination route, with the sperm migrating from the head to the center of the body where fertilization occurred. The flatworms that were kept in groups differed however by having sperm located in their tails.
This therefore could be the first case of flatworms using their needle like penis to eject sperm into their own head, it is suggested this may be due to there being no internal link between their male and female organs.

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